CN213275742U - Quick testing arrangement of metal zinc oxide arrester reconsistance electric current - Google Patents
Quick testing arrangement of metal zinc oxide arrester reconsistance electric current Download PDFInfo
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- CN213275742U CN213275742U CN202022346207.8U CN202022346207U CN213275742U CN 213275742 U CN213275742 U CN 213275742U CN 202022346207 U CN202022346207 U CN 202022346207U CN 213275742 U CN213275742 U CN 213275742U
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Abstract
The utility model relates to a quick testing arrangement of metal zinc oxide arrester reconfiguration resistive current, including sampling current sensor and host computer, sampling current sensor includes that first current sensor CT1 and second electric current passThe sensor CT2 comprises a first current sensor CT1 connected with the lightning arrester to be tested on the same high-voltage bus, and a second current sensor CT2 arranged in a circuit of a capacitive device connected with the lightning arrester to be tested on the same high-voltage bus; the main machine comprises a calculation module and a capacitor dielectric loss tangent input module, the first current sensor CT1 and the second current sensor CT2 are both connected with the calculation module, the capacitor dielectric loss tangent input module is connected with the calculation module, and the calculation module is used for calculating the leakage current IXLeakage current ICAnd analyzing and calculating the dielectric loss tangent data to obtain the resistive current IR. The utility model discloses can compensate current measuring equipment defect for MOA resistive current measures and has accuracy and security concurrently, and the state aassessment to arrester in service has important meaning.
Description
Technical Field
The application relates to the technical field of online monitoring system design of a metal zinc oxide arrester, in particular to a device for quickly testing the reconstructed resistive current of the metal zinc oxide arrester.
Background
The metal zinc oxide arrester (MOA) has good nonlinear characteristics, can prevent various electric power equipment connected in parallel with the MOA from being influenced by abnormal high voltage, is widely applied to an electric power system, and is an indispensable ring for ensuring the safe and stable operation of the electric power system.
The MOA can have the phenomenon of valve plate aging or wetting in the long-term operation process, so that the protection capability of the MOA is reduced and even the MOA fails. At the initial stage of the insulation degradation of the valve block inside the lightning arrester, the resistive current under the operating voltage of the lightning arrester can be obviously increased, the capacitive current is not changed greatly, and the total current and the resistive current under the operating voltage are important parameters for judging the operating state of the lightning arrester.
The existing commonly used resistive current extraction method is to acquire a voltage signal from an electromagnetic voltage transformer (PT) or a Capacitance Voltage Transformer (CVT) of a loop of a tested arrester, acquire a leakage current signal of the zinc oxide arrester, synchronously sample the voltage signal and the current signal, and calculate the resistive current of the zinc oxide arrester by resistive current extraction algorithm software. The traditional method can extract the resistive current of the zinc oxide arrester under the condition that the arrester is electrified, so as to further analyze the insulation condition of the zinc oxide arrester and judge whether the zinc oxide arrester can continuously operate in a system to protect power equipment.
The acquisition of system voltage (arrester voltage) is the basic requirement for accurately measuring the resistive current of the metal zinc oxide arrester. The measurement of the system voltage comprises a secondary voltage method, an induction plate method and a compensation method. The measurement device adopting the induction plate method and the compensation method influences the precision of the resistive current of the lightning arrester due to inaccurate reference voltage; the measurement device for obtaining reference voltage from the secondary side of the voltage transformer has stable and credible test reference voltage and resistive current results, but because the secondary voltage of the voltage transformer needs to be obtained in live detection, the secondary side short circuit caused by misoperation can cause malfunction of a relay protection device, and the safety and stability of a power system are seriously influenced.
Therefore, it is a main problem to be solved at present to provide a device capable of measuring resistive current without measuring system voltage signals in an arrester loop.
SUMMERY OF THE UTILITY MODEL
The application provides a quick testing arrangement of metal zinc oxide arrester reconstructed resistive current to solve and obtain resistive current through the mode of obtaining system voltage earlier at present, but electrified detection needs to obtain voltage transformer secondary voltage, probably causes the relay protection device malfunction because of the maloperation leads to the secondary side short circuit, seriously influences electric power system's safety and stability's problem.
The technical scheme adopted by the application is as follows:
the utility model relates to a quick testing device for the reconstructed resistive current of a metal zinc oxide arrester, which comprises a capacitive device, a sampling current sensor and a host,
sampling current sensor includes first current sensor CT1 and second current sensor CT2, first current sensor CT1 establish with the arrester that awaits measuring connects on same high-voltage bus, first current sensor CT1 is used for measuring the full current I that awaits measuring the arrester ground connection downlead that awaits measuring flows throughXThe second current sensor CT2 is disposed in a circuit of the capacitive device connected to the same high-voltage bus as the lightning arrester to be tested, and the second current sensor CT2 is configured to measure a leakage current I flowing out of a grounded down conductor of the capacitive device in phaseC；
The host includes a calculation module to which the first and second current sensors CT1 and CT2 are connected, and a capacitor dielectric loss tangent input module connected to the calculation module,
the first current sensor CT1 will be full current IXThe measurement result is transmitted to the calculation module, and the second current sensor CT2 transmits the leakage current ICThe measurement result is transmitted to the calculation module, the capacitor dielectric loss tangent value input module is used for transmitting the dielectric loss tangent value data of the last preventive test of the capacitive equipment to the calculation module, and the calculation module transmits the dielectric loss tangent value data to the calculation module according to the full current IXThe leakage current ICAnd analyzing and calculating the dielectric loss tangent data to obtain resistive current IR。
Further, the capacitor equipment comprises an in-phase capacitor, an in-phase current transformer and an in-phase main transformer high-voltage bushing end screen.
Further, the host comprises a signal receiving module, a signal comparing module, a resistive current solving module and a signal output module,
first current sensor CT1 and second current sensor CT2 all with the signal reception module input is connected, the output of signal reception module with the input of signal comparison module, the output of signal comparison module with the input of resistive current solution module is connected, the output of resistive current solution module with the input of signal output module is connected.
Furthermore, the signal receiving module sequentially comprises an A/D conversion unit, a signal amplification unit and a filtering unit.
Further, the second current sensor CT2 is a passive zero flux feedthrough transformer.
The technical scheme of the application has the following beneficial effects:
the utility model discloses a quick testing arrangement of metal zinc oxide arrester reconfiguration resistive current to MOA resistive current measurement accuracy and security can not be got concurrently, design out and do not rely on voltage transformer to acquire the resistive current detection device of metal zinc oxide arrester of arrester voltage to avoid the protection device malfunction because of acquireing voltage transformer secondary side voltage and leading to. The MOA and the capacitive equipment leakage current are respectively obtained by adopting the first current sensor and the second current sensor, and the calculation and extraction of the MOA resistive current are realized through signal processing, synchronous acquisition and an integration algorithm of the calculation module and the capacitor dielectric loss tangent input module.
The resistive current measuring device can effectively make up for the defects of the existing measuring equipment, so that MOA resistive current measurement has both accuracy and safety, and has important significance for state evaluation of the lightning arrester in operation;
and simultaneously, the utility model discloses do not need complicated wiring, and can measure practical convenient on the spot.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a device for rapidly testing the reconstructed resistive current of a metal zinc oxide arrester;
illustration of the drawings:
wherein, 1-high voltage bus; 2-a lightning arrester; 3-capacitive devices; 4-a signal receiving module; 5-a signal comparison module; 6-resistive current solving module; 7-capacitance type equipment dielectric loss tangent value input module; 8-a signal output module.
Detailed Description
Referring to fig. 1, a schematic structural diagram of a device for rapidly testing a reconstructed resistive current of a metal zinc oxide arrester.
The application provides a quick testing arrangement of metal zinc oxide arrester reconfiguration resistive current, including capacitive type equipment, sampling current sensor and host computer.
Specifically, the sampling current sensor comprises a first current sensor CT1 and a second current sensor CT2, the first current sensor CT1 is connected with the lightning arrester to be tested on the same high-voltage bus, and the first current sensor CT1 is used for measuring the total current I flowing through the grounding down lead of the lightning arrester to be testedXThe second current sensor CT2 is arranged in the circuit of the capacitive equipment connected with the lightning arrester to be tested on the same high-voltage bus, and the second current sensor CT2 is used for measuring the leakage current I flowing out of the grounding down conductor of the capacitive equipment in phaseC；
The host computer comprises a calculation module and a capacitor dielectric loss tangent input module, the first current sensor CT1 and the second current sensor CT2 are both connected with the calculation module, the capacitor dielectric loss tangent input module is connected with the calculation module,
the first current sensor CT1 will deliver the full current IXThe measurement result is transmitted to the calculation module, and the second current sensor CT2 transmits the leakage current ICThe measurement result is transmitted to the calculation module, the capacitor dielectric loss tangent value input module is used for transmitting the dielectric loss tangent value data of the last preventive test of the capacitive equipment to the calculation module, and the calculation module transmits the dielectric loss tangent value data to the calculation module according to the full current IXThe above-mentionedLeakage current ICAnd analyzing and calculating the dielectric loss tangent data to obtain resistive current IR。
The capacitive equipment comprises an in-phase capacitor, an in-phase current transformer and an in-phase main transformer high-voltage bushing end screen.
The host computer includes signal reception module, signal comparison module, resistive current and solves module and signal output module, and first current sensor CT1 and second current sensor CT2 all are connected with the signal reception module input, the output of signal reception module with the input of signal comparison module, the output of signal comparison module with the input of resistive current solution module is connected, the output of resistive current solution module with the input of signal output module is connected.
The signal receiving module comprises an A/D conversion unit, a signal amplification unit and a filtering unit in sequence.
Specifically, the reconstructed resistive current fast testing device for the metal zinc oxide arrester of the embodiment includes a capacitive device, a sampling current sensor and a host,
the current sensor comprises a first current sensor CT1 and a second current sensor CT2, and the first current sensor CT1 is used for measuring the leakage current I flowing through the grounding down conductor of the lightning arrester to be testedXA second current sensor CT2 for measuring the leakage current I flowing from the grounded down conductor of the in-phase capacitive deviceC；
The host comprises a signal receiving module, a signal comparison module, a resistive current solving module, a capacitor dielectric loss tangent value input module and a signal output module;
the signal receiving module is used for synchronously receiving I measured by the CT1XAnd I measured by CT2C；
The signal comparison module is used for comparing IXAnd ICTime difference ^ t between, and convert the time difference to a phase angle difference
The capacitance type device dielectric loss tangent value input module is used for inputting the dielectric loss tangent value data b of the capacitance type device in the last preventive test.
The resistive current solving module is used for solving the leakage current I flowing through the lightning arresterXResistive current I inRFirstly, solving the dielectric loss angle delta of the capacitor as arctan (b), then solving the equivalent dielectric loss tangent angle theta of the lightning arrester as phi + delta, and finally solving the resistive current I of the lightning arresterR＝Ix×sinΦ；
The signal output module is used for outputting the resistive current I calculated by the resistive current solving moduleR。
Aiming at the dilemma that the measurement accuracy and the safety of the MOA resistive current cannot be achieved simultaneously, the embodiment designs the metal zinc oxide arrester resistive current detection device which does not depend on a voltage transformer to obtain the voltage of the arrester so as to avoid the misoperation of the protection device caused by obtaining the voltage of the secondary side of the voltage transformer. The MOA and capacitive equipment leakage current is respectively obtained by adopting a first current sensor and a second current sensor, and the MOA resistive current is calculated and extracted through signal processing, synchronous acquisition and integration algorithms of a signal receiving module, a signal comparison module, a resistive current solving module, a capacitor dielectric loss tangent input module and a signal output module.
The resistive current measuring device can effectively make up for the defects of the existing measuring equipment, so that MOA resistive current measurement has both accuracy and safety, and has important significance for state evaluation of the lightning arrester in operation;
and simultaneously, the utility model discloses do not need complicated wiring, and can measure practical convenient on the spot.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
Claims (5)
1. A quick testing device for the reconstructed resistive current of a metal zinc oxide arrester is characterized by comprising a capacitive device, a sampling current sensor and a host,
sampling current sensor includes first current sensor CT1 and second current sensor CT2, first current sensor CT1 establishes and connects on same high-voltage bus with the arrester that awaits measuring, first current sensor CT1 is used for measuring the full current I that awaits measuring arrester ground connection downlead flows throughXThe second current sensor CT2 is disposed in a circuit of the capacitive device connected to the same high-voltage bus as the lightning arrester to be tested, and the second current sensor CT2 is configured to measure a leakage current I flowing out of a grounded down conductor of the capacitive device in phaseC；
The host includes a calculation module to which the first and second current sensors CT1 and CT2 are connected, and a capacitor dielectric loss tangent input module connected to the calculation module,
the first current sensor CT1 will be full current IXThe measurement result is transmitted to the calculation module, and the second current sensor CT2 transmits the leakage current ICThe measurement result is transmitted to the calculation module, the capacitor dielectric loss tangent value input module is used for transmitting the dielectric loss tangent value data of the last preventive test of the capacitive equipment to the calculation module, and the calculation module transmits the dielectric loss tangent value data to the calculation module according to the full current IXThe leakage current ICAnd analyzing and calculating the dielectric loss tangent data to obtain resistive current IR。
2. The metal zinc oxide arrester reconfiguration resistive current rapid test device according to claim 1, characterized in that said capacitor equipment comprises an in-phase capacitor, an in-phase current transformer and an in-phase main transformer high-voltage bushing end screen.
3. The metal zinc oxide arrester reconfiguration resistive current rapid test device according to claim 1 or 2, wherein the host computer includes a signal receiving module, a signal comparing module, a resistive current solving module and a signal output module,
first current sensor CT1 and second current sensor CT2 all with the signal reception module input is connected, the output of signal reception module with the input of signal comparison module, the output of signal comparison module with the input of resistive current solution module is connected, the output of resistive current solution module with the input of signal output module is connected.
4. The device for quickly testing the reconstructed resistive current of the metal zinc oxide arrester according to claim 3, wherein the signal receiving module sequentially comprises an A/D conversion unit, a signal amplification unit and a filtering unit.
5. The device for rapidly testing the reconstructed resistive current of the metal zinc oxide arrester according to claim 1, wherein the second current sensor CT2 is a passive zero-flux feedthrough transformer.
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| CN202022346207.8U CN213275742U (en) | 2020-10-20 | 2020-10-20 | Quick testing arrangement of metal zinc oxide arrester reconsistance electric current |
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